package com.bird.jdk.抽象;

/**
 * @author sijunqiang
 * @data 2021/3/27 23:09
 * @description: 定义一个抽象类
 */
public abstract class Instrument {

    private int i; // storage allocated for each

    //抽象方法
 //   public abstract void play(Note note);

    //
    public String what() {
        return "Instrument";
    }

    public abstract void adjust();




}
